Product Details
●The AD7982 is an 18-bit, successive approximation, analog-to- digital converter (ADC) that operates from a single power supply, VDD. It contains a low power, high speed, 18-bit sampling ADC and a versatile serial interface port. On the CNV rising edge, the AD7982 samples the voltage difference between the IN+ and IN− pins. The voltages on these pins usually swing in opposite phases between 0 V and VREF. The reference voltage, REF, is applied externally and can be set independent of the supply voltage, VDD. Its power scales linearly with throughput.
●The SPI-compatible serial interface also features the ability, using the SDI input, to daisy-chain several ADCs on a single 3-wire bus and provides an optional busy indicator. It is compatible with 1.8 V, 2.5 V, 3 V, and 5 V logic, using the separate VIO supply.
●The AD7982 is available in a 10-lead MSOP or a 10-lead QFN (LFCSP) with operation specified from −40°C to +85°C.
●Applications
● Battery-powered equipment
● Data acquisition systems
● Medical instruments
● Seismic data acquisition systems
●### Features and Benefits
● 18-bit resolution with no missing codes
● Throughput: 1 MSPS
● Low power dissipation
● 4 mW at 1 MSPS (VDD only)
● 7 mW at 1 MSPS (total)
● 70 μW at 10 kSPS
● INL: ±1 LSB typical, ±2 LSB maximum
● Dynamic range: 99 dB typical
● True differential analog input range: ±VREF
● 0 V to VREF with VREF between 2.5 V to 5.0 V
● Allows use of any input range
● Easy to drive with the ADA4941-1 or ADA4940-1
● No pipeline delay
● Single-supply 2.5 V operation with 1.8 V, 2.5 V, 3 V, and 5 V logic interface
● Proprietary serial interface SPI-/QSPI™/ MICROWIRE™-/DSP-compatible
● Ability to daisy-chain multiple ADCs and busy indicator
● 10-Lead MSOP and 3 mm × 3 mm 10-Lead LFCSP
